symons



L. G. SYMONS ROTARY FLUID PUMP FeB. 3, 131.

Filed Dec. 26, 1928 2 smts-shmz' l VIII/(11965 H ATTORNEY Patented Feb. 3, 1931 anion LGBEN G. SYMONS, OF HOLLYWOOD, CALIFORNIA, ASSIGhTOB TO arrow 1.. moans,

OF VAN NUYS, CAEIIFORNIA ROTARY FLUID PUMP Application filed December 26, 1928. Serial No. 328,349.

My invention relates to an improvement in rotary pumps and in particular to an 1111- provement in the type of rotary pump in which apumping screw or worm is rotated in mesh with a grate member which prevents the rotation with the rotor of the fluid being 1 pumped. Que object is the provision of a' hello-ally vaned rotor and a gate meshing and in closing engagement. with the rotor so that leakage of the pump shall be maintained .at a minimum. Another object is to provide a novel and efiective form of gate composed of relatively movable members having alternating teeth thereon for engagement with the helical vane of the rotor and formed for close engagement so as to close the cylinder at the points of en agement against leakage.

fther objects will appear from time to time in the course ofthe specification and claims.

1' illustrate my invention more or less diagrammatically in the accompanying drawings, wherein:

Fig. 1 is a transverse section of a pump 25 embodying my improvements.

2 1s a face view ofone of-the gate mem ers.

Fig. 3 is a section of the same on the line .3-3 of Fig. 2. 0. Fig. i is a plan view of another of the gate members.

Fig. 5 is a section ofthe same on the line 5-5 of Fig. 4.

Fig. dis a sectional plan of the pump on a reduced scale on line 6-6 of Fig. 1.

Fig. '7 is a view of the rotor and gate in operative engagement.

Fig. 8 is a section of the same on line 8-8 of Fig. 7.

Fig. 9 is another view of the rotor and gate ngaged at difi'erent' relative positions from 1 l. fiig. 10 is a section ofthe same on the line 10-10 of Fig. 9.

A indicates an suitable base or sup orting member u on w ich the umphous ng A1 is mounte and may inclu e supporting portions A2 having feet A3 secure to the membar A by means of bolts A4. The-pump cylinder B maybe mounted or C1 and thus with an out -in detail. The worms formed on the portion A2 of the pump frame,

and provided with an intake manifold B1 in connection with an inlet passage B2, as shown in Figure 6, and provided with inlet ports B4, B4, at the ends, for aifording communication with the interior of the cylinder B. G indicates an outlet passage, shown in Figure 6 as intermediate the ends of the cylinder and communicatin with the chamber it duct C2.

The pump rotor includes the shaft ends D1 and D2 which rotate in the bearings D3, D3 at the ends of cylinder B. Said bearings inwardly from the ends of the cylinder chamber.

The rotor body D5 engages the opposed faces of the bearings B3, B3 at its ends. Any

" suitable means may be employed for rotating the rotor, as for example a train of gears, not herein shown, D2 and driven by any suitable motive power, not herein shown.

The enlarged body D5 of the rate? has axial and thrust along the'axis of rotation of the rotor. The worms E and E1 are identical except that one is right and the other is left hand, and the gates cooperating with the worms are identical, although rotating in opposite directions. Only one of the worms and one of the gates will be described are of generally uniform height and thichi'ess from end to end,

are mounted in bosses D4, D4 which extend associated with he shaft save for a relatively short tapered portion 7 E2 at each end. It will be understood that the end of the worm terminates along a plane generally radial in relation to the axis of rotation of the rotor.

to end.

Each vane or worm meshes with a ate as at G, and the tgates G, G are positione at opposite sides 0 the pump housing. Each suchgate includes two relatively movable members, shown in detail in Figures 2 to 5 inclusive. One of these members has a web' The body D5 oftherotor is of identical diameter from end site facets and the opposed facets G of each tooth are concentric, while the opposite facets G6 are cencentric with the axis of the gate.

A second gate member G7 is provided on its periphery with radial lugs G8 of the same thickness and radius as the lugs G3 and terminating at the same distance from the tops of the gate teeth. Projecting from each of said lugs G8 are teeth G9 identical with the teeth G4. When the member G7 is placed within the member G1 and its aperture G10 alined with the aperture G2, the

and mesh with the worms distance between the opposed end faces of the lugs G3 and G8 is such as to permit a certain degree of relative rotation of the .two members and of their respective'teeth.

The entire gate assembly so formed is inserted within a ate housing H, integral with the pump rame, which includes a channel H1 adapted snugly to receive the teeth G4 and G9. This channel intersects the interior of the pump cylinder B in such fashion that at one point in their rotation the teeth G4 and G9 project into the interior of the pump chamber to the extent of their entire height and closely engage the opposed surface of the rotor member D5 E and E1. The gate members are held in position by a plug H2 which has a central boss H3 seating in the apertures G2 and G10. Rotation of member H2 is prevented for example by a pin H4 one portion of which seats in the pump frame and the other in the boss H3 which is apertured to receive it. ilplug H5 may be screwed into the portion for enclosing each of the gates and: for affording access thereto when and if necessary.

It will be realized that whereas I have described and shown a practical and operative device, nevertheless many changes may be made in the size, shape, number and dis.- position of parts without departing from the spirit of my invention. I t erefore wish my description and drawings to be taken as in a broad sense matic rather than as limiting me to my specific showing. y

The use and operation of are as follows:

One of the great problems in the successmy invention ful use of rotary pumps of the general type herein described, and probably the major reason why such pumps have not gone into more general use, is the difliculty in constructing a ate with teeth which mesh with the worm 0% the rotor sufliciently tightly to prevent leakage.

illustrative and diagram-' along the worm, now, defines gitudinal movement of the face of the worm,

at any given point about the periphery of the cylindrical casing, is uniform. The result is that in order to make a gate which will mesh uniformly, and will uniformly close the space between the vanes, some means must be developed for compensating for this differential factor. My solution has been to permit individual and adjacent gate members ameasure of relative movement.

Consider first Figures 7 and 8 and assume that the gate-is moving in clockwise tion. The tooth or gate member indicated as a has moved into engagement with the outside of the thread, the teeth I) and 0 are within the thread and the tooth d is about to move out of contact with the outside of the opposite end of the thread. Note that a, meeting the face of the thread at'a substantial angle, is spaced apart from the tooth b by a considerably greater distance than the space separating b and 0 which may be described as lying along or generally parallel with the axis of the rotor. Similarly a greater distance separates 0 and d, which lie in an angular relation to the thread and rotor similar. to that of a and I). Were the various gate members not removably mounted it is clear that they would either cramp in meshing with the thread, or would have to be made with greater clearance. If they cramp, they render the device inoperative. If they are made with greater clearances, theycause leakage. But when the teeth are made relatively movable one set moves toward and away from directhe other in such fashion asto compensate I for the variation in the angular relation of the line of approach of any individual tooth to the opposed worm surface against which it moves.

Consider Figures 9 and 10 as showing a different position. The tooth at, having moved a more acute angle in relation to the axis. The tooth b may be described as parallel with the axis, and the tooth 0 lies at an angle equal to but reverse to that of the tooth 0. Since angular relation between a and b is the sameas that between 0 and b the teeth will be at the same distance from each other and note that in Figure 10 the individual teeth members.are equally spaced about the gate, in

' thereon, a gate mounted for rotation about" paralleling the axis of the contrast to the unequal spacing or grouping of Figure 8. r

I claim:

1. In a fluid ump, a rotor and a housing therefor, a fluit inlet to said housing and a fluid outlet from said housing, said rotor including a body portion and a helical vane thereon, a gate mounted for rotation about an axis perpendicular to theaxis of rotation of the rotor, said gate including a plurality of teeth paralleling the axis of the gate and adapted tOJIlGSlI with said vane and means for permitting relative movement of said teeth in relation to each other.

2. In a fluid pump, a rotor and a housing therefor, a'fluid inlet to said housing and a fluid outlet from said housing, said rotor including a body portion and a helical vane an axis perpendicular to the axis of rotation of the rotor, said gate including a plurality of sets of teeth paralleling the axis of the gate and adapted to mesh with said vane and means for permitting relative movement of said sets of teeth in relation to each other.

3. In a fluid pump, a rotor and a housing therefor, a fluid inlet to said housing and a fluid outlet from said housing, said rotor having a helical vane thereon, a gate mounted forrot-ation about an axis perpendicular to the axis of rotation of the rotor, said gate including a plurality of sets of teeth gate and adapted to mesh with said vane and means for permitting relative movement of said sets of b teeth in relation to each other, said sets being arranged with the teeth of each set alternating about said gate.

4. In a fluid pump, a rotor and a housing therefor, a fluid inlet to said housing and a fluid outlet therefrom, said rotor including a body portion and a helical vane thereon, said vane constituting a worm, the thickness of said worm being uniform throughout substantially the entire length of the worm, the

\ separation between opposed walls of the worm being substantially uniform from end to end of the worm, a gate mounted for retation about an axis perpendicular to the axis of rotation of the rotor, said gate including a plurality of teeth paralleling the axis of the gate and adapted to mesh with said worm, and means for permitting movement of said teeth in relation to said gate member.

5. In a fluid pump, a rotor and a pump chamber in which said rotor rotates, a fluid inlet to said chamber and a fluid outlet therefrom, said rotor including a helical worm, a gate mounted for rotation about an axis perpendicular to the axis of rotation of the rotor, said gate including a plurality. of teeth paralleling the axis of the gate and adapted to mesh with said'worm, and means for permitting relative movement of adjacent teeth in relation to each other.

in relation to each other, two associated rotary members having said- 6. In a fluid pump, a rotor and a pump chamber in which saidrotor rotates, a fluid inlet to said chamber and a fluid outlet therefrom, said rotor including a helical worm,

a gate member mounted for rotation about c an axis perpendicular to the axis of rotation of the rotor, said gate including a plurality of teeth paralleling the axis of-the gate and adapted to mesh with said Worm, and means for permitting relative movement of adjacent teeth in relation to each other, said gate including two associated rotary base portions the said teeth being said portions, the two portions being relatively movable. v v

7 In a fluid pump, a rotor and a pump chamber in which said rotor rotates, a fluid inlet to said chamber and a fluid outlet therefrom, said rotor including a helical worm, a gate mounted for rotation about an axis perpendicular to the axis of rotation of the rotor, said gate including a plurality of teeth paralleling the axis of the gate and adapted to mesh with said worm, and means for permitting relative movement of adjacent teeth said gate including teeth distributed between said members, the two members being relatively movable, the teeth being arranged to alternate on the two members.

8. In a fluid pump, a therefor, a fluid inlet to outlet from the housing,

rotor and a housing the housing, a fluid the rotor including-a ody portion and a helical vane thereon, a composite gate mounted for rotation about an axis perpendicular to the axis of rotation of the rotor and including telescoping body portions with alternating teeth arranged in the same operative plane and adapted to mesh with said vane, and means for permitting relative movement of said body portions for automatically adjusting the teeth for contact with said vane.

9. In a fluid pump, a rotor and a housing therefor, a fluid inlet to the housing, a fluid outlet from the housing, the rotor including a body portion and a helical vane thereon, a composite gate mounted for rotation about an axis perpendicular to the axis of rotation of the rotor and including telescoping body portions with alternating teeth arranged inthe same operative plane and adapted to mesh with said vane, and means for permitting relative movement of said body portions for automatically adjusting the teeth for contact with saidvane, said teeth having inner and outer faces concentric with the axis of the gate, for the purpose described.

10. In a fluid pump, a rotor and a housing therefor, a fluid inlet to the housing, a fluid outlet from the housing, the rotor including a body portion and a helical vane thereon, a composite gate mounted for rotation about an distributed between axis perpendicular to the axis of rotation of the rotor and including telescoping body portions with alternating teeth arranged in the same operative plane'and adapted to mesh with said vane, means for permitting relative movement of said body portions, for automatically. adjusting the teeth for contact with said vane, said teeth having inner and outer facets concentric with the axis of the ate, and opposite facets arcuately formed or frictional contact with said vane.

11. In a fluid pump, a rotor and a housing therefor, a fluid inlet to and a fluid'outlet from said housing, said rotor including a body portion and a helical vane thereon, a gate mounted for rotation about an axis perpendicular to the axis of rotation of the rotor,

said gate including a pair of concentricmembers, one of said members nested concentrical- 1y within the other member, said members havingvsets of teeth alternating with each other and adapted to mesh with said vane, and

- means for permitting relative movement of said teeth, for the purpose described.

LOREN G. SYMONS. 

